As of March 21st 2006, Roddick ranked as the best male US tennis player and the fourth-best in the world by the Association of Tennis Professionals, behind Roger Federer, Rafael Nadal and David Nalbandian. Roddick is known for his explosive serves, powerful forehands, and off-court charm and personality. He also holds the fastest serve record (clocked at 155 mph, or 250 km/h).